Process of defecating saccharine juices.



No. 738,328.-v

.l `ls'AulzNTLD sEPT.8,19os. I J.v J. HIGNBTTB. lRooBss of DBPEGATINGSACCHARINE JUICBS.

APPL IGATION FILED APR. 27. 1898.

N0 MODEL.

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ha? libri-ggg? UNITED STATES Patented September 8, 1903.

`PATENT OFFICE.

JEAN JULES HIGNETTF., OF PARIS, FRANCE.

SPECIFICATION forming part of Letters Patent No. 738,328, datedSeptember 8, 1903. Application filed April 27, 1898. SerialNo. 678,997.(No specimens.)

dent of Paris, France, have invented certain new and useful Improvementsin the Process of Defecating Saccharine Juices, of which the f followingis a specification.

This invention 'relates to an improved process for treating andpurifying sugar-jnice.

The juice is first lightly limed or barytaed, then decanted, in order tofree it from the mud or sediment. lt is then introduced continuouslyinto a centrifugal having a basket with imperforate walls and alsoprovided with a diaphragm, which centrifugal receives simultaneously thecarbonation and bleaching gases, (carbonio acid, sulfurous acid, and thelike.) In consequence of the reactions produced in this apparatus andowing to the action of centrifugal force the mass under treatment isseparatedinto two partsone the clarified juice, which escapes with thegas by a pipe having a small orice, and the other the semiiluid mud orsediment, which is constantly discharged by another pipe.v

This mud mixed with the first mud from the decantation is brought into asecond centrifugal having a basket with imperforate Walls, but nodiaphragm, and in which itis treated byasimilar process in order toremove therefrom the last remains of sugar-juice which it contains.

Theapparatus intended for carrying out this process is shown in theaccompanying drawing.

In the drawing, A represents a tank divided into twoliXiviating-compartments and provided with agitators A and B, driventhrough bevel-gears ct' and b' from a shaft b b2, provided withabelt-pulley b3. The material to be treated is fed to the compartmentsfrom a hopper A2 by an endless conveyer A3.

C is a decantation-reservoir connected by pipes c and c withliXiViators; F F', centrifugals having baskets T T' with imperforatewalls. The centrifugal F comprises internally a diaphragm D. l

H L S are pipes for the circulation of the juice.

P and Q4 are pumps.

K is a pipe for introducing the gas which passes through a washin gdevice G.

`N R O are pipes for conveying the mud.

E is a mixing apparatus, and M a limingtank.

The juice to be treated is first of all conveyed into the liXiviators AB, in which it is mixed with a small proportion of lime, (or baryta).This limed juice is conveyed into tank C, from the bottom of which theprecipitated mud is removedV by a helicoidal conveyer C. The part of thejuice decanted off flows, on the other hand, by pipes IgI, provided withfloat-valves I, into a number of centrifugals F. This number variesaccording to the size of the factory. The centrifugals F employedin thissystem are centrifugals having a closed casing and a basket T, with im-"perforate walls, revolving at a high speed.

Under the action of centrifugal force and the lime in solution in thejuice there is deposited on' the walls of the drum T in each centrifugala muddy layer of slight consistency, which contains a large proportionof the organic substances contained in the diffusionjuice of thebeet-root.

If to the action of the lime there be simultaneously added in thecentrifugals that of a current of carbonio-acid gas introduced by a pipeK, coming from a lime-kiln and passing through a washing device G, thefollowing phenomenze are producedz' Vhile the lime saturates the freeacids and continues to cause deposits by the decomposition of thealbumenoid substances, the carbonic acid in contact with the solution oflimed juice produces carbonate of lime, which is particularly favorableto the rapid and complete precipitation of azotic substances. Thecarbonio acid producing the carbonate of lime is employed in theproportion which is strictly necessary in order to maintain an averagealkalinity favorable to the absolute and permanent decoloration of thejuice. Under the action of the centrifugal force and by'means thereofthe carbonate of lime is precipitated on the walls of the baskets,together with about thirty per cent. of the organic substances containedin the juice. This partially-carbonated mud is black and is charged withorganic substances relatively poor in sugar, because the sucrate formedis decomposed gradually by the carbonio acid.

lf it is desired to immediately at the same IOO time bleach the juice,gaseous sulfurous acid is introduced into the centrifugals, and in thiscase the latter must be provided with hermetical covers or lids. Thejuice discharged at L, emulsioned by the gas, is already yery fluid andalmost entirely free from color.` Its purification is completed by asecond cold liming in order to precipitate all the lime in the conditionof carbonate and saturate the excess of carbonic acid. Finally it issent by a pump Q and pipe S into a vat M, where it is heated to about 80centigrade'in A order to complete' the eliminationof the gas and finishthe precipitations, then filtered, and then sent to the boiling-'downapparatus.

The precipitate formed under the action of centrifugal force in thecentrifugal F does not accumulate in the latter. It is removed asproduced, so that there is no need to stop the centrifugal at certainmoments in order to empty it. This continuity of operation produces aconsiderable economy of time and labor.' This result is obtained by thecombined use of the bent pipe N and horizontal diaphragm D in thc formof a ring, the external circumference of which is at a certain distancefrom the cylinder. This diaphragm being placed at an intermediate levelbetween the points Where the pipes L and N open,it will be seen that thepipe L, placed above the diaphragm, gives passage to sugar-j uice,whichis lighter than the liquid mud that is stopped by the interposeddiaphragm and which passes through the pipe N. The mud thus eliminated,as Well as that arising from the deposit of the decantation in the vat Cof the limed juice, is forced, respectively by pipes N and R, into amixer E. There the mud is diluted with weak sugar juice or drainings, towhich some thousandths of lime are added, and the whole is conveyed bymeans of the pump P and pipes O into a centrifugal F', having a basketT', with imperforate walls, but without This treatment of the mud by thesame principles as the treatment of the sugar-juice by the use ofacids-and bases and the system of decantation by centrifugal forceallows of the loss of sugar being considerably reduced, whilesimplifying the labor required. v My method of treatment and thedecoloration of the juice without bone-black and without the multiplecarbonatations at present employed is thus completed, with considerableeconomy in labor, lime, and carbonic acid.

I declare that what I claim isl. The herein-described process ofsimultaneously carbonating and clarifying sugarjuice which consists incontinuously introducing limed juice into a centrifugal andsimultaneouslyintroducing carbonic-acid gas intol the centrifugal,substantially as described.

2. The herein-described process of simultaneously carbonating andclarifying sugarl juice which consists in continuously introducing limedjuice into a centrifugal, simultaneously indroducing carbonic-acid gasinto the centrifugal and carrying the separated mud to a secondcentrifugal for further treatment with carbonic-acid gas, su bstantiallyas described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

JEAN JULES HIGNETTE.

Witnesses:

JOSEPH DELAGE, EDWARD P. MACLEAN.

